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CVE-2026-48843

Published: May 25, 2026Updated: May 26, 2026 Sources: CVE List NVD BDUCWE-918
NVD MITRE
7.2CVSSHIGH
EPSS Score
0.3%
Top 79.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. The issue stems from an insufficient fix for CVE-2026-35540.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-918

Affected Products

WebmailRoundcube
Web App
Communications / email-server-client
RoundCube WebmailThe RoundCube Team
On-prem
Communications / email-server-client
roundcubeoss-projectDECommunicationsaka roundcube webmail, roundcube
the roundcube teamoss-projectCommunicationsaka roundcube webmail

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
roundcube.net
https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
github.com
https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a
github.com
and 6 more references View all →

Timeline

Published
May 25, 2026
Last Updated
May 26, 2026

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